emery



(No Model.)

B. 0. EMERY.

INSULATOR.

Patented Dec. 20

Edward (T Emery.

WI TJV ESSES UNITED STATES PATENT OFFICE.

EDWVARD G. EMERY, OF SAN DIEGO, CALIFORNIA.

INSULATO R.

SPECIFICATION forming part of Letters Patent No. 375,276, dated December20, 1887.

Application filed September 1, 1887. Serial No. 248.511. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD O. EMERY, a citizen of the United States ofAmerica, residing at San Diego, in the county of San Diego. and State ofCalifornia, have invented certain new and useful Improvements inInsulators; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being bad to the accompany ing drawings, and to letters orfigures of reference marked thereon, which form a part of thisspecification.

My invention relates to certain new and useful improvements ininsulators for telegraph or other electric wires, the object of myinvention being to provide a cheap, simple, and effective means-forattaching the wires to the insulator, so that they can be readilydetached therefrom when desired, the wires being connected with theinsulator in such a manner that they can be stretched without removingthe insulator; and with the above ends in view my invention consists inthe construction and combination of the parts, as will be hereinafterfully set forth, and specifically pointed out in the claims.

In the accompanying drawings, which illustrate my invention, Figure 1 isa sectional vview of an insulator constructed in accord ance with myimprovement, and Fig. 2 is a detail perspective view of the cap or toppiece.

A refers to the peg or support for the insulator, which maybe attachedto the cross-bar of the telegraph-pole or other suitable support, theupper end of said peg being externally screw-threaded.

the part (3. The width of the slot is substantially the same as thediameter of the wire with which the insulator is to be used. Thecap-piece D has formed therein a socket, 01, into which the projectingportion 0 will fit, and the sides of this cap-piece are provided atpoints diametrically opposite with slots E and E, the terminal portionsof which extend at an obtuse angle with the vertical portion thereof,the lateral-extending portions of the slots being turned in oppositedirections.

The portions Band D of the insulator are preferably made of glass orlava, though other suitable materials may be employed, and between theparts is placed a flexible or rubber washer, F, which will allow aslight spring movement between the parts.

To place a wire in position, the cap-piece is first removed and the wireis passed into the slot in the projecting portion 0. The 'cappiece isthen placed over the wire, said wire entering the slots E and E, and bygiving the cap-piece a slight turn the wire will be ele vated into theupturned portion of the slot in the projecting portion 0 and will entertheinclined portions of the slots E and E.

By use of the hereinbefore-described device the wire passes through theinsulator without a bend, and is held securely in position with-' outthe aid of screw-bolts or other extraneous locking means, for as saidWire forms a hearing for the top piece, the pressure of said top pieceor cap upon the wire forcing the same upon the washer, so as to preventthe rotation of the cap, and as the upper portions of the slots in thecap extend in opposite directions, it cannot become accidentallyturned,so as to allow the wire to fall below the depending portion 0 in theprojecting portion 0.

I claim 1. In an insulator, the combination of theinternally-screw-threaded part B, having a central upwardly-projectingportion with a J shaped slot formed transversely therein, and a cap, D,having a socket and slots E and E formed therein, the inner end of theJ-shaped slot and the slots E E being arranged diametrically,substantially as and for the purpose set fort-h. v

2. In an insulator, the combination of the ICO portion B, provided witha central upwardly- In testimony whereof I affix my signature inprojecting portion, which is provided with a presence of two witnesses.transverse slot, the lower portion of said slot being curved upwardly,so as to provide a de- EDWARD O. EMERY. 5 pending portion, a, cap-pieceD, having slots E and E, the upper ends of said slots extend- Witnesses:

ing in opposite directions, and a washer, F, CHAS. W. PAULY,

substantially as and for the purpose set forth. FRANK J. HIGGINS.

